Liquid-fuel spraying and injecting device



De@7 30 i924.

G. PIELSTHCK LIQUID FUEL SPRAYING AND INJECTING DEVICE Filed April 4,1922 ,|r". All" Patented Dec. 30, 1924.

lUNITED STATES 1,521,389 PATENT oFFllcE.

GUSTAV PIELSTICK, F AUGSBURG, GERMANY, ASSIGNOR TO THE FIRM'MASC'HINEN-FABBIK AUGSBURG-NUERNBERG AKTIENGESELLSCHAFT, OF AUGSBURG, l GER- MANY,A GERMAN CORPORATION.

LIQUID-FUEL SPRAYING- AND INJECTING DEVICE.

Application led April 4, 1922. Serial No. 549,619.

To all lwhom t mag/concern.

Be it known that lI, GUsTAv PIELSTICK, a citizen of the German Republic,residing at Augsburg, Germany, have invented cer- 6 tain new and usefulImprovements in Liquid-Fuel Spraying and In-jecting Devices, of whichthe following is a specification.

This invention relates to a device for l0 spraying or atomizing liquidfuel and injecting it into the cylinders of internal combustionengines;V It relates more especially to that type of devices in whichthe fuel is atomized by the action of highly compressed air directlybefore being injected.

The main object of the invention is to rovide a. simple4 and effectivedevice of the 'nd referred to, in which an improved atomization of thefuel and a thorough mixlo ing of fuel and air may be obtained.

Another object of the invention is to reduce the number of parts to aminimum and to eliminate in particular all such parts which wouldrequire individual adjustment w or setting. f I

According to the invention the diffuser cone is made integral with theguide for the needle valve, which guide vis suitably provided with shortradial arms serving as 0 distance pieces within the valve casing so thata sleeve-like channel is formed for the passage of the highlycompressed. air. Means are provided to cause the compressed air to enterthe device so that part of it will 5 force the fuel downwardly in thedirection of the valve seat, whilst the remaining part intercepts thefuel at approximately right angles to its direction of flow shortlybefore it passes the valve seat, thereby causing an Q intense turbulenceand an `effective' atomization of the fuel which, according to theinvention, is made to enter the device in the immediate proximity of theconical valve seat.

The accompanying drawing shows by way of example a central longitudinalsection throu h an injection valve constructed in accordance with theinvention.

In this drawing 1 is the valve cage within which the combined needlevalve guide and diffuser cone 2 and the needle valvei3 areconcentrically arranged. The fuel is admitted through a passage 4. intoan annular chamber formed around the diffuser conevin the diffuser.

immediate proximity of the conical valve seat .5. The compressed airenters through a conduit 6 into the sleeve-like passage7 above When theneedle valve 3 is lifted, part of the compressed air rushes through theclearance 8 between the diffuser cone and the inner wall of the valvecage, t thereby forcing the fuel which is contained therein downwardlythrough the gap 9, and past the conical valve seat 5. The remaining partof the 'compressed air enters simultaneously through the drill holes 10into the hollow 11 formed between the needle valve and the diffuser.From here it rushes e at high velocity through the narrow annularclearance 12 and intercepts the stream of fuel passing at right anglesthereto lthrough the gap 9,'whereby the intense impact between the twostreams causes an eiective turbulence and, a complete atomization of thefuel. Having passed the valve 5 the mixture of fuel and air passesthrough the noz` zle plate 13 into the combustion space of the cylinder.A spring 14 is provided to maintain the diffuser in its proper position,whereas short radial arms 15 and 16 near the ends of the valve guideportion serve as vice for internal combustion engines the combinationwith a needle valve and a diffuser of means to, admit the fuel closelyabove the valve 'seat and means'to cause the compressed air to partlyforce the jfuel downwardly through the valve opening and partly, tointercept the stream of fuel at right angles to the direction of itsflow below the diffuser and above the valve opening.

2: In a -fuel s rayingL and injecting device for interna combustionengines the combinatlon with a valve cage, a needle valve and adiffuser, of a sleeve-like passage between the diifuserand the valvecage, an annular fuel chamber at the lower end thereof, a fuel passagein communication with said chamber, passages to admit compressed airfrom above the fuel chamber and passages to divert part ofthe compressedair so as to interceptvthe stream of the-fuel at right angles to thedirection of its flow below the diffuser and above thevalve opening.

3. In a fuel spraying and injecting device for internal combustionengines, the combination with a valve cage, a needle valve andavdiffuser cone of an annular fuel chamber external of the diffuser cone,'a-sleeve-like air passage above the said diffuser cone, a narrowannular clearance between the'said fuel chamber and the sleeve-like airpassage, a narrow gapbetween the lower end surface ofthe diffuser coneand the valve lcage bottom, a hollow nspace within the diffuser coneencircling the needle valve with a slight clearance at its lower end,and of passages connecting the sleeve-like passage with the said hollowspace.' l

4. 'A fuel, spraying and Iinjecting device for internal combustionengines' having in combination a valve cage, a needle'valve, a needlevalve guide integral with a diffuser cone, distance pieces for the saidguide and diffuser cone within the valve cage, passages including anannular fuel chamber to admit fuel into the device closely above thevalve seat,v air passages arranged so as to divert a stream ofcompressed air to partly act on the fuel level in the annular chamberand partly to intercept the stream of fuel at approximately right anglesto the direction of its 'flow at a place intermediate thc annular fuelchamber and the needle valve seat. v

In testimony whereof I have hereunto set my hand, 1n the presence of twosubscribing witnesses.

GUSTAV .PIELSTICK Witnesses:

ALEXANDER DE So'ro, ALEXIS v. PHILIPPOFF.

